It's still there for the Z10 & Z30, I see it in my Amazon cloud. Maybe it's locked out for the Passport? Anyone else seeing this?

Cloud doesn't matter. It doesn't show in search any longer. Much like a lot of other apps. If you downloaded it before they 'hid' it, it should always show but alas, new folks looking to download it will never find it.

Have to wonder what's behind all these apps being hidden. I can't imagine they received any support requests for monument valley, so there must be some other reason...
Perhaps the developers now have to list supported devices... any not specified don't see the app? does anyone here have any of their apps in the Amazon store that could comment?
Seems like a recent change.

BlackBerry should ask that pp be listed as "unknown" again so we'd have access to all the apps.

Well, bad news here... No app, no refund, no nothing...
Here is Amazon's reply:
"(...)I've checked and found that "Monument Valley" is in your account, I would like to inform you that "Monument Valley" is not compatible with your device "Blackberry Passport." I know how it feels when something like this happens and it sure doesn't feel good. Moreover, you can also request a certain app be made available on your device, by submitting feedback from your device to our Technical Team by pulling down the Menu from the Home screen and selecting "More." Tap "Help & Feedback," and then tap "Feedback." Choose "Apps" from the drop-down, and enter the name of the app you're interested in. Customer feedback like yours helps us continue to improve the service we provide, and we're glad you took time to write to us. The Kindle Team will carefully review your comments for the availability of this app as soon as possible and will update it for you as we will get any information regarding this. I hope you can understand our limitations because app compatibility with any device is depend on the manufacturers. As we're the marketplace, we do not have the means to decide the app compatibility of sold by manufacturers. I'm afraid to tell you the exact time in which the app become available. However; I assured you that our Appstore team will definitely work hard to make the app available for your device as soon as possible. (...)[/I][/I][/I]
Nicely answered, but...